一种宽频带方形槽圆极化天线设计

文中提出了一种加载微扰元素的新型宽频带圆极化方形槽天线,它由一个倒L 型微带馈电线、一个L 型枝节、一对矩形槽和一个方形槽地板组成。用这些缝隙槽和枝节作为微扰元素来调节天线表面电流分布,可以激 发出多个圆极化谐振模式,从而实现了宽频带圆极化辐射。为了验证其合理性,加工并测试了天线模型。测量结果 表明,实测小于-10 dB 的阻抗带宽为74. 9%,小于3 dB 的轴比带宽为84. 7%。此外,测量和仿真的峰值增益分别为 4. 88 dBi 和4. 86 dBi。因此,文中设计的圆极化方形槽天线具有宽的圆极化带宽特性。

Design of a Broadband Square-slot Circularly Polarized Antenna

The antenna is consisted of an inverted L-shaped feeding line, an L-shaped strip, a pair of rectangular slots and a square-slot ground. The numerous circular polarization resonant modes are excited simultaneously using these slots and patches as perturbation elements to change the surface current distribution. To verify this rationality, an antenna prototype is printed and manufactured. The measured results indicate the -10dB impedance bandwidth (IBW) is 74. 9% and 3 dB axial ratio bandwidth (ARBW) is 84. 7%. Furthermore, the measured peak gain is 4. 88 dBi, and the simulated peak gain is 4. 86 dBi. Therefore, the presented antenna features wide circular polarization bandwidth (CPBW).